• A communications protocol used by hosts and adjacent routers on IPv4 networks to establish multicast group memberships. IGMP is an integral part of IP multicast and allows the network to direct multicast transmissions only to hosts that have requested them. The protocol can be used for one-to-many networking applications such as online streaming video and gaming, and allows more efficient use of resources when supporting these types of applications. IGMPv1 was defined in 1989 by RFC 1112. ← Wikipedia

1. Related terms: Resource Reservation Protocol, Internet Protocol, Authenticated Transfer Protocol, Internet Control Message Protocol
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